From 5ed7ecd08a0807d6d616c3d958402f9c723bb048 Mon Sep 17 00:00:00 2001 From: Aneesh Kumar K.V Date: Fri, 29 Apr 2016 23:26:23 +1000 Subject: powerpc/mm: pte_frag abstraction In this patch we make the number of pte fragments per level 4 page table page a variable. Radix level 4 table size is 256 bytes and hence we can have 256 fragments per level 4 page. We don't update the fragment count in this patch. We need to do performance measurements to find the right value for fragment count. Signed-off-by: Aneesh Kumar K.V Signed-off-by: Michael Ellerman --- arch/powerpc/mm/hash_utils_64.c | 3 +++ arch/powerpc/mm/pgtable-radix.c | 5 +++++ arch/powerpc/mm/pgtable_64.c | 4 ++++ 3 files changed, 12 insertions(+) (limited to 'arch/powerpc/mm') diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c index 68aee435ea97..262082e51db1 100644 --- a/arch/powerpc/mm/hash_utils_64.c +++ b/arch/powerpc/mm/hash_utils_64.c @@ -873,6 +873,9 @@ void __init hash__early_init_mmu(void) /* * initialize page table size */ + __pte_frag_nr = H_PTE_FRAG_NR; + __pte_frag_size_shift = H_PTE_FRAG_SIZE_SHIFT; + __pte_index_size = H_PTE_INDEX_SIZE; __pmd_index_size = H_PMD_INDEX_SIZE; __pud_index_size = H_PUD_INDEX_SIZE; diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c index 13afacdfa96e..a5a5253c3ea1 100644 --- a/arch/powerpc/mm/pgtable-radix.c +++ b/arch/powerpc/mm/pgtable-radix.c @@ -334,6 +334,11 @@ void __init radix__early_init_mmu(void) __vmalloc_end = RADIX_VMALLOC_END; vmemmap = (struct page *)RADIX_VMEMMAP_BASE; ioremap_bot = IOREMAP_BASE; + /* + * For now radix also use the same frag size + */ + __pte_frag_nr = H_PTE_FRAG_NR; + __pte_frag_size_shift = H_PTE_FRAG_SIZE_SHIFT; radix_init_page_sizes(); if (!firmware_has_feature(FW_FEATURE_LPAR)) diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c index 216e2bda8f2c..95df08e73559 100644 --- a/arch/powerpc/mm/pgtable_64.c +++ b/arch/powerpc/mm/pgtable_64.c @@ -107,6 +107,10 @@ unsigned long __vmalloc_end; EXPORT_SYMBOL(__vmalloc_end); struct page *vmemmap; EXPORT_SYMBOL(vmemmap); +unsigned long __pte_frag_nr; +EXPORT_SYMBOL(__pte_frag_nr); +unsigned long __pte_frag_size_shift; +EXPORT_SYMBOL(__pte_frag_size_shift); unsigned long ioremap_bot; #else /* !CONFIG_PPC_BOOK3S_64 */ unsigned long ioremap_bot = IOREMAP_BASE; -- cgit v1.2.3